Kamara is a long shot to be involved, although this is not the first time the Finnish under-21 international has been in training this season, but Arsenal's options in midfield are too plentiful to use him in such a big game.

When it comes to Matt Macey, they can be less picky.

With Damien Martinez and Wojciech Szczesny on loan at Wolves and Roma, Macey may be the club's fifth choice goalkeeper, but he has risen up the pecking order as a result.

Colombian international David Ospina is sidelined with a shoulder injury and did not train, meaning he is unlikely to feature in the Champions League on Tuesday night.

That leaves Macey as the only back-up to Petr Cech, who was controversially rested in the defeat to Olympiakos.

Don't expect Arsene Wenger to repeat this again, but the Gunners cannot afford to have anything happen to the Czech Republic veteran, or 21-year-old Macey will be thrust into action on the biggest stage of all.

Dan Coombs

Dan Coombs is a writer who is keen to embrace the internet revolution. He first started writing for us in June 2011 and commenced his new role as Sports Editor in February 2012.
As a trained journalist he has met famous faces from Mr T to Boris Johnson. He once featured in an England World Cup music video too, but it did not make the charts.
He grew up wanting to be a Formula 1 driver, but it looks like this dream has passed him by. Instead, he hopes you enjoy reading his writing on our site, as we seek to debate the day's sporting hot topics.